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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: shandybills on May 08, 2022, 01:58:07 PM

Title: k100 misfire judder
Post by: shandybills on May 08, 2022, 01:58:07 PM

My 1988 k100 has a misfire on tickover sounds like a clunk and the revs drop for a split second, also seen when balancing TB  the gauges drop like a missed beat, Initially had a dud coil replace with a second hand one all cylinders running but still have the misfire, When riding it seems a bit boggy or fluffy or holding back. Thinking it could be hall sensor or coolant temp sensor. Any help guys.

Title: Re: k100 misfire judder
Post by: Laitch on May 08, 2022, 02:36:30 PM

How old is the fuel filter? Have you checked the tank fuel hose connections for tightness? Does the crankcase breather hose have splits in it?

Title: Re: k100 misfire judder
Post by: shandybills on May 08, 2022, 05:11:53 PM

just took the hall sensor off and looks like someones done some soldering bodge in it the solder joints were not insulated so assuming this could be the problem

Title: Re: k100 misfire judder
Post by: Laitch on May 08, 2022, 11:08:44 PM

 icon_cheers

Title: Re: k100 misfire judder
Post by: shandybills on May 11, 2022, 04:59:58 PM

Changed plugs, leads, One coil changed as was only running on 3 now all 4 work. Changed the Hall pickup trigger sensor and not cured the problem, if i take a vacuum cap off i can see a flash down the hole when it misses a beat